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Two comments
First, I think changing students belief systems takes more than getting
them interested. Sometimes it seems the new experience has to really
get their attention, almost wack them over the head, before they begin
to rethink.
I support this by having students overtly discuss their
predictions and experiences with each other, working to come to
consensus before we have a whole class discussion.
Second, I have found ray diagrams less then obvious to students unless
you spend some time working with them in a simple context. I use
McDermott's...no relation??
...material on projecting light through
holes to do this. We take ray diagrams as simple and straight (pardon
the pun) forward. My experience is that they are not to the
uninitiated.